Dark Haloes of Fossil Galaxy Groups and Clusters:. Observations and Simulations

Details Dark Haloes of Fossil Galaxy Groups and Clusters:. Observations and Simulations Dark Haloes of Fossil Galaxy Groups and Clusters:. Observations and Simulations

Apr 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008dmap.conf..317k&link_type=abstract

DARK MATTER IN ASTROPARTICLE AND PARTICLE PHYSICS. Proceedings of the 6th International Heidelberg Conference. Held 24-28 Septem

Physics

Galaxies, Clusters, Elliptical Galaxies, Intergalactic Medium, Dark Matter

Scientific paper

We present results from our recent studies of a class of galaxy groups and clusters known as "Fossils" which are dominated by a giant elliptical galaxy and are arguably the end product of mergers of galaxies within groups. Fossils are the archetypal relaxed systems thus seen as simple laboratories to study formation and evolution of galaxies and haloes in the absence of recent major mergers.
Multi-wavelength study of the largest sample of fossil systems in the observations complemented by cosmological simulations were undertaken to understand their origin and evolution. We study the dark matter distribution in fossils using their X-ray derived mass profiles. Fossils show higher halo concentration, for a given mass of the halo, compared to non-fossil groups and clusters indicating an early formation epoch for fossils. The study of their mass evolution in the Millennium simulations, including hot gas and semi-analytic galaxies, shows that their haloes form earlier than those of non-fossil systems. We estimate the space density of fossils in the simulations which agrees well with the observations.

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